Uncovering the truth about WW2’s Katyn massacre

Historian and biographer Jane Rogoyska explains how more than 20,000 Polish prisoners-of-war were murdered on Stalin’s orders in the spring of 1940. Plus, she explores the decades-long coverup that saw the Soviet Union accuse its Nazi foes of committing the atrocity.

Read more: Roger Moorhouse tells the story of the brutal 1939 invasion of Poland